Snowplow



Patented Oct. 8, 1929 UNITED .STATES AYTENT oFFls KNUT `SPIilRIfIlYfGr GRAN GYLLENKROOK, OF'WAXHOLM, SWEDEN sNoWrLow Application filed November 23, 1926, Serial No. 150,352. and in Sweden December 1, 1925.

In driving snow plows with the aid of tractors, which has been lately practised to great extent, the plow is generally connected to the tractor in front of the same, so that the tractor will-shove the plow before it. The plow is then carried by carrying members sliding` on the plowed plane, and the deep-drawing of the plow is controlled by the latter being raised or lowered relatively to the carrying member or members. The device which hitherto has been available for the purpose is not satisfactory. In the first place, the function of the carrying member sliding on the Isnow is obviously dependent on the nature of the snow. In loose, new-fallen snow the carrying member is apt to cut down into the snow, so that the plow, even if its elevated position relatively to the carrying member is adapted in a certain manner, still moves at too great a depth, often as far down as to the solid road. Hard-packed or wet snow evidently has a reverse action and actuates the carrying member upwards, so that the plow is brought into a position which is too elevated, the remaining layer of snow being then too deep.

This experience is responsible for the idea to provide such an arrangement of the carrying member vproper thatthe same may be caused by a simple adjustment to carry to a greater or smaller extent.

'Io this end the invention in view is principally distinguished by the fact that different parts of the surface of the carrying member utilized for the carrying effect have a 'diderent extension in the carrying plane, the carrying member being adjustable in such a manner that a larger or smaller portion of the carrying surface will be active according 4.5 as the carrying member is differently adj usted with respect to the nature of the snow.

The arrangement is'devised in the simplest and most suitable manner so that the carrying member forming a downwardly arcuate sliding runner is made tapering toward the one end, preferably the fore end, which is pivotally attached to the plow in any suitable manner. Behind the pivot, the carrying member is movably connected to a device by means 531 of which it may be swung vertically so that the rear end of it is raised or lowered. On this adjustment, the Ywidth of the carrying surface is obviously increased or decreased according as the rear end is lowered or raised respectively.

The accompanying drawing illustrates an embodiment of theinvention. Fig. l is a rear view of a snow plow provided with an arrangement according to theJ invention, andr Fig. 2 shows the same viewed from theV side in verticalsection. Fig. 4 is a plan viewl of the carrying member, and Fig. 3 showsto an enlarged scale and in vertical section a ymechanical device suitable for the adjustment of the carrying member'.

Extending at the rear between the plow wings l is a shaft 2 with which the tractor therebehin'd is connected in such a manner that the plow may swing with its point up and vdown about the shaft. 'The shaft is carried at the ends by meansof adjusting screws 3 which may be screwed up and down in nuts l rigidlyconnected with the plow wings l. With the aid of ball and socket joints,zthe screws are connected with blocks 5 having the shaft threaded therein. This' arrangement permits relative adjustment of the plow wings to the proper'levels.

In the embodiment shown, the carrying member 6 according to the invention has the form of an isosceles triangle with a comparatively acute top angle with which latter the member is directed forwards 'and is pivot-4 ally attached to the plownear the p oint thereof, by means of a bolt? or in some other suitable manner. The carrying member: is arcuate downwards and rearwards from the point of attachment, so ,that the carrying member Ais caused in any angular posit-ion to' slideon the snow like a runner, without the risk beingV incurred of the carrying membery 'cutting down into the snowor road. vAt the middle' portion or approximately at the middle por'- tion of the member 6, there is attached a sleeve 8 which is spherically shaped on the iinsi'de and which is `adapted to enclose a' ball. 9 at the lower end of a screw 10, the threaded plor tion of which is engaged in a nut 11 provided atthe front near the upper edge oftheplow.- The said nut 11 is spherical and enclosedv by swung in the longitudinal central plane ot the plow when screwed up or down, or when compelled to take part in any lateral movements of the carrying member 6. In order that the nut 11 shall not take part in the ro'- tary movement of the screw, it is provided with a stud la entering a slot in the lixed parts l2, said slot having such an extension as to permit the said swinging movement of the screw in the central plane of the plow within the required limits. f

lvhenthe screw l() is screwed down, the carrying member is swung with its rear end downwards about the pivot 7 so that, according as the turning movement progresses, an ever increasing carrying surface ot the member :is made active. 'The looser the snow, the further will the carrying' member be swung down. 7When the snow is wet or packe d hard, the screw l0 on the contrary is screwed upwards so that the member 6 is raised at the rear end, whereby an yever decreasing surface or the member will be active, according asv the screw is screwed further upwards.

Obviously, the details of the arrangement may be altered in the embodiment described and illustrated. As tothe `carrying member,

i the condition must be fulfilled, however, that it shall be of such a shape as to oder carrying surfaces of varying sizes in diti'erent positions of adjustment. It is also evident that more than one member arranged and acting in the manner set forth may be provided in the same plow.

Vhat I claim as new and desire to secure byv Letters Patent of U. S. A. is-

1. In combination with a snow plow having converging side members, of a carrying member of triangular shape in plan view and ot a downwardly arcuate shape in longitudinal section, means for pivotally mounting said carrying member at its apex adjacent the intersection of said side members, means 'for adjusting said carrying member on its pivot relative to the side members; comprising a threaded ball jont held in spaced relation' to said side members, and an adjusting screw passing through said ball joint, having its lower end articulated in said carrying member.

2. In combination with a. snow plow having converging side members of a carrying member ot' triangular shape in plan view and of a downwardly arcuate shape in longitudinal section, means for pivotally mounting said carrying member'at its apex adjacent the intersectionof said side members, and means for adjusting said carrying member on its pivot relative to the side members comprising an adjusting screw articulated in said carrying member at one end and connected through a-vball joint lixedly mounted in spaced relation to said side members.

3. In combination with a snow plowhaving converging side members of a carrying member of triangular shape in plan view and of a downwardly arcuate shape in longitudinal section for making Contact with the road along the curved surface of the member, means for pivot-ally mounting said carrying member at its apex adjacent the intersection of the side members, and means to adjust the carrying member on its pivot relative to the side members.

4l. In combination with a snow plow having converging side members of a carrying member of trangular shape in plan View and of a downwardly arcuate shape in longitudinal section, means for pivotally mounting said carrying member at its apex adjacent the intersection of said side members, means tor adjusting said carrying member on its pivot relative to the side members comprising a threaded ball joint held in spaced relation to said side members, an adjusting screw passing through said threaded ball joint having its lower end slidably engaging said carrying member, and a stud projecting from the spherical nut of the ball joint entering a 'slot in the fixed surrounding of the said ball joint thereby preventing the spherical nut from moving with the adjusting screw, the length of said slot being such as to permit of swinging of the adjusting screw within predeternined limits in the central plane of the plow.

In testimony whereof I affix my signature.

KNUT SPERLING GRN GYLLENRGK. 

